Coat 8 cups of the muffin pan with cooking spray. Divide the spinach mixture among the 8 cups (they will be very full).

4

Bake the spinach cakes until set, about 20 minutes. Let stand in the pan for 5 minutes. Loosen the edges with a knife and turn out onto a clean cutting board or large plate. Serve warm, sprinkled with more Parmesan, if desired.